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Topic Review (Newest First)

09-01-2009 04:12 PM

chevrolet327

i have change my torque with a 2400 stall 10 inch and i also have give 4 degree avance on camshaft and change the edelbrock 750 for a truck avenger 770
incredible difference that what i looking for thanks for the help

07-16-2009 03:52 PM

chevrolet327

Quote:

Originally Posted by techinspector1

Should work with SCR of 8.75:1 to 10.75:1. 112 degree lobe separation angle should produce more manifold vacuum and smoother idle than a 110 or 108 or 106 grind. It's not the type of cam I might use if I were looking for power in a mud truck. I wouldn't be particularly interested in manifold vacuum or idle quality. I'd probably be looking for a narrower LSA.

Agree with ap72 about the agresssive ramps. If you deduct the advertised duration from the 0.050" duration, you get 43 degrees on the intake and 41 degrees on the exhaust. This is pretty radical, so on a cam like this, I'd resist using other than a stock 1.5 rocker ratio.

Think about it this way: If there is a total of 41 degrees difference between 0.006" tappet lift and 0.050" tappet lift, that means that (given a symetrical lobe) there is 20.5 degrees of difference on each side of the lobe (20.5 on the opening ramp, 20.5 on the closing ramp). That's in crankshaft degrees. If you convert that to camshaft degrees, that means that the lobe is lifting the tappet from 0.006" off the base circle to 0.050" off the base circle in just 10.25 degrees of camshaft movement. That's on the ragged edge of geometric feasibility without having the edge of the tappet digging into the cam lobe.

In my opinion, putting this kind of stress on the valvetrain parts for a very small gain in power is ludicrous.

do you have a good recomman dation for my setup

07-16-2009 12:40 PM

Chevrolet4x4s

Have you thought abought double transfer casing it?
Shane

07-16-2009 07:27 AM

manchildau65

4.10 is the lowest gear ratio you can run with the carrier you have. I would also agree that lowering the ratio will net better power response. Try 4.56, you can get a set from a CUCV or M1008 that would already have a Detroit locker in the 14 bolt (that's what I run).

07-16-2009 07:18 AM

ap72

Quote:

Originally Posted by techinspector1

Should work with SCR of 8.75:1 to 10.75:1. 112 degree lobe separation angle should produce more manifold vacuum and smoother idle than a 110 or 108 or 106 grind. It's not the type of cam I might use if I were looking for power in a mud truck. I wouldn't be particularly interested in manifold vacuum or idle quality. I'd probably be looking for a narrower LSA.

Agree with ap72 about the agresssive ramps. If you deduct the advertised duration from the 0.050" duration, you get 43 degrees on the intake and 41 degrees on the exhaust. This is pretty radical, so on a cam like this, I'd resist using other than a stock 1.5 rocker ratio.

Think about it this way: If there is a total of 41 degrees difference between 0.006" tappet lift and 0.050" tappet lift, that means that (given a symetrical lobe) there is 20.5 degrees of difference on each side of the lobe (20.5 on the opening ramp, 20.5 on the closing ramp). That's in crankshaft degrees. If you convert that to camshaft degrees, that means that the lobe is lifting the tappet from 0.006" off the base circle to 0.050" off the base circle in just 10.25 degrees of camshaft movement. That's on the ragged edge of geometric feasibility without having the edge of the tappet digging into the cam lobe.

In my opinion, putting this kind of stress on the valvetrain parts for a very small gain in power is ludicrous.

Its not THAT bad TI, but yea, in most cases I'd step up in rocker ratio rather than lobe intensity- you accomplish the same thing but things seem to last longer. If you want to do a low buck cam swap in an otherwise stock engine the agressive 262 series of cams from the big manufacturers seem to be very good though- IF you can keep them from wiping out.

I also agree on the tighter LSA- especially if you're going with a 3000 stall. a 106 or 108 would probably be MUCH more appropraite.

Should work with SCR of 8.75:1 to 10.75:1. 112 degree lobe separation angle should produce more manifold vacuum and smoother idle than a 110 or 108 or 106 grind. It's not the type of cam I might use if I were looking for power in a mud truck. I wouldn't be particularly interested in manifold vacuum or idle quality. I'd probably be looking for a narrower LSA.

Agree with ap72 about the agresssive ramps. If you deduct the advertised duration from the 0.050" duration, you get 43 degrees on the intake and 41 degrees on the exhaust. This is pretty radical, so on a cam like this, I'd resist using other than a stock 1.5 rocker ratio.

Think about it this way: If there is a total of 41 degrees difference between 0.006" tappet lift and 0.050" tappet lift, that means that (given a symetrical lobe) there is 20.5 degrees of difference on each side of the lobe (20.5 on the opening ramp, 20.5 on the closing ramp). That's in crankshaft degrees. If you convert that to camshaft degrees, that means that the lobe is lifting the tappet from 0.006" off the base circle to 0.050" off the base circle in just 10.25 degrees of camshaft movement. That's on the ragged edge of geometric feasibility without having the edge of the tappet digging into the cam lobe.

In my opinion, putting this kind of stress on the valvetrain parts for a very small gain in power is ludicrous.

07-15-2009 08:45 PM

ap72

Its a very torquey cam shaft, great for street, but in your heavy viehicle and higher compression it may ping- if you run premium and keep it in first with that 3000 Stall you'd probably be safe though.

Voodoo's require a very close attention to detail though, their agressive ramps can wipe out fast fi you're not careful.

i have called a 10 inch 3000 stall i will let you know the difference thanks.

07-14-2009 12:11 AM

inquiring_mind2

I mud race and I think you need a stall and some different gears then it would wake the motor up or go down in tires size.

07-13-2009 05:39 PM

ap72

It may be- if that is the case though you won't gain anything by it. Its like stepping from a Buick 455 to a nailhead- you're going the wrong direction.

You need to look at a higher stall first- you'll be AMAZED at how much an extra 1500 stall can do. going from a stock conv. to a 3000 or a 3500 can wake up almost any engine.

07-13-2009 04:46 PM

chevrolet327

i have the solid roller that suppose to go with the cam

07-13-2009 04:39 PM

chevrolet327

i think its a very old setup i can read 265-283 on plate of the rev kit

07-13-2009 04:37 PM

ap72

I don't think its a solid roller then- mayb eits just a solid flat tappet. .450" at the valve isn't really in solid roller territory unless you need EXTREEMLY fast opening ramps for restricted circle track racing even then though going with a higher rocker ratio would make more sense.

07-13-2009 04:35 PM

chevrolet327

no 450 at the valve

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